Table of Contents

Setting Up a Data Connection
Configuring Data Channel Redundancy
Using an Interface Control Template
Enabling DFM and Data Channel Utilization
Enabling Embedded EIA Operation on the LDP or LDM
Setting Up DDS Trunks
Summary of Commands
addcon
cnfchdfm
cnfcheia
cnfcldir
cnfdchtp
cnfdclk
cnfict
cpyict
delcon
dspchcnf
dspcon
dspcons
dspict
prtchcnf
prtcons
prtict

Data Connections

Data commands apply to the setting up, configuring, and statistical reporting on data connections. For descriptions of the data commands on a FastPAD, refer to the FastPAD User's Guide. Examples of the tasks described in the chapter are:

• Setting up a circuit line and a data connection

• Configuring data channel redundancy

• Using interface control templates

• Enabling DFM and data channel utilization

• Enabling Embedded EIA operation

• Setting up DDS trunks

The nodes and card sets to which the commands in this chapter apply are:

• On an IPX, the card sets are the:

  • SDP/SDI

  • LDP/LDI

  • CDP/BC-T1, BC-E1, or BC-J1

• On an IGX, the card sets are the

  • HDM/SDI,

  • LDM/LDI

  • CVM/BC-T1, BC-E1, or BC-J1

Setting Up a Data Connection

To set up a data connection:

Step 2   Add the connection with the addcon command. The above configuration must have been completed at each end before the connection can be added.

Configuring Data Channel Redundancy

You can configure redundant data channels by installing two identical card sets in adjacent slots and connecting the cards to the customer's line through a Y-cable. Applicable commands are"

• Use the addyred command to establish the redundant connection between the two card sets.

• Use the delyred command to remove redundancy from a redundant pair.

• Use the dspyred command to display Y-cable configurations.

• Use the prtyred command to print Y-cable configurations.

Using an Interface Control Template

Data channels have an associated default interface control template for each of the active (normal), conditioned, looped, near and far states. The templates define how the control leads at the data interface are to be configured (asserted, inhibited, follow a local source or follow a remote source). You can change an interface control template by using the cnfict command. If you use cnfict, you must individually configure each template and each control lead. You can use cpyict to apply (copy) the settings of a template for one data channel to the template for another data channel.

Enabling DFM and Data Channel Utilization

DFM (Data Frame Multiplexing) is a feature on the IPX and IGX. With DFM enabled, repetitive data patterns (such as idle codes) are suppressed at the source and regenerated at the remote node. This feature has the effect of approximately doubling the bandwidth of the data channel. DFM is also known as Repetitive Pattern Suppression (RPS).

The command for changing the DFM enable-status for individual data channels is cnfchdfm. Before you execute this command, make sure the DFM feature has been activated on each applicable node by the WANSwitching Technical Response Team (TRT). You can check the DFM configuration for a channel by using the dspchcnf command. When the DFM feature is first activated at a node, it has the following default values:

• Percent of channel utilization is 100%

• Pattern length is 8 bits

• DFM status is enabled.

Enabling Embedded EIA Operation on the LDP or LDM

The EIA feature encodes the status of the CTS or RTS lead as the eighth bit in each data byte. The byte subsequently is processed in accordance with the DFM algorithm, which remains unchanged.

Any DCE and DTE combination at each end is valid. A typical configuration might have the LDP at one end of a connection as DCE (normal clocking) and an LDM at the other end as DTE (looped clocking). RTS is transmitted in encoded form from the remote end to the local end, and CTS is transmitted in the other direction. Other EIA leads use the non-interleaved format.

The EIA feature is allowed for all legal baud rates 19.2 kbps and below and is activated by typing encoding type 7/8E followed by an *Z when adding a connection using the addcon command. Different channels on the same card may be set up with or without the feature, but all ports on the card must be configured at or below 19.2 kbps for EIA to be active. Note that you do not have to enter *Z after 7/8E on the command line because the system automatically enters it.

Setting Up DDS Trunks

DDS Trunks normally operate at 56 Kbps. The IPX and IGX can provide a direct interface to a DDS line and provide limited distance access to Data Service Units (DSUs) by using the DDS format over private lines. The LDI4/DDS back card and LDP (Model B) or LDM front card support DDS. Each LDI/DDS supports four DDS trunks in DSU or OCU modes.

• Use the cnfdchtp command to configure the DDS port. Specify OCU or DSU for the port type.

• Add the connection using the addcon command. When prompted for the rate, enter 2.4 Kbps,
  4.8 Kbps, 9.6 Kbps, 19.2 Kbps, or 56 Kbps.

Summary of Commands

The following list shows the full command name and starting page of each description:

addcon

Establishes data channel connections between nodes in a network. After you add a connection using the addcon command, the node automatically routes the connection. The node where you execute addcon is the "owner" of the added connections. The concept of ownership is important because you must enter information about automatic rerouting and preferred routing at the node that owns the connection. See the cnfpref and cnfcos commands for more information on automatic rerouting. Before the node adds the connection, the proposed connection appears on the screen with a prompt for you to confirm the addition.

When applied to data connections, the addcon command adds a synchronous data connection to the network. You can add synchronous data connections to any node slot equipped with either an LDP or SDP card in an IPX or an LDM or HDM in an IGX. Before you add a connection, determine the desired data rate. To find the data rates that individual cards support, refer to the card descriptions in the IGX Reference Manual or the IPX Reference Manual.

When connecting sets of data channels, you do not have to specify the full channel set for the local end of the connection. You have to designate only the first channel in the range. For example, to add connects 27.1-4 at local node alpha to channels 9.1-4 at beta, you can enter "addcon 27.1-4 beta 9.1". If Y-cable redundancy has been specified, you can add data connections at only primary card slots (not at the secondary card slots). See the addyred description for more information. Table 8-2 lists the data rates. The following notations appear with some data rates:

cnfchdfm

Enables or disables DFM for individual channels and sets the DFM parameters for the channels. The default state when the (purchased) DFM feature is activated on a card is enabled. Because DFM is a purchased option, the WANSwitching TRT must activate on the applicable nodes before you use the cnfchdfm command. The cards that support the use of cnfchdfm are the SDP and LDP on the IPX and the LDM and HDM on the IGX.

The DFM feature must be both installed and enabled. The DFM feature must be installed through software control at each node terminating the connection. If DFM is not installed for a pertinent node in the network, the cnfchdfm command has no effect at that node. Furthermore, you must use cnfchdfm at both ends of the connection to enable DFM.

Full Name

Configure channel DFM

Syntax

cnfchdfm <channel(s)> <7 | 8 | 16> [e | d]

Related Commands

dspchcnf

Attributes

Example 1

cnfchdfm 5.1 8

Description

Set the DFM pattern length to 8 bits for data channel 5.1

System Response

cnfcheia

Sets the sampling rate for the updating EIA control leads. This rate can be set from 0 (no sampling) to 20 updates per second and defaults to 2 seconds. This rate governs the polling interval and packet generation rate for the EIA leads associated with the channel.

At 20 updates/sec, the control leads are polled for changes every 50 msec. Therefore, changes occurring more rapidly than that may not be detected. If there is no change in EIA lead status, no packet is sent. A minimum of one update per second is sent if the maximum update rate chosen is from 1 to 20. If the connection is configured in such a way that an implied isochronous clock is detected, the update rate is always 20/sec in the same direction as that of the clock signal. For 1.544 Mbps data connections, this defaults to 0.

Full Name

Configure EIA update rate for channels

Syntax

cnfcheia <channel(s)> <update_rate>

Related Commands

dspchcnf

Attributes

Example 1

cnfcheia 5.1 15

Description

Set the EIA update rate to 15 sec. for data channel 5.1

System Response

cnfcldir

Sets the control lead direction for pins 11 and 23 on the RS-232 data channels of an SDP or HDM card set. This allows the control leads to carry "backward" channels. Pins 11 and 23 on an RS-232 interface are bi-directional. The signals on these pins can have various names, such as SI, SF, CH, CI, and QM. To display control lead information about pins 11 and 23, use the dspbob command. Use the cnfict command to configure the behavior of all output leads.

Full Name

Configure control lead direction.

Syntax

cnfcldir <channel> <lead> <direction>

Related Commands

cnfict, dspbob, dspict

Attributes

Example 1

cnfcldir 3.1 11 input

Description

Configure lead number 11 of channel 3.1 to be an input. The screen example shows the display after the system has accepted the input as valid.

System Response

cnfdchtp

Configures a CDP, CVM, or LDP or LDM DDS port interface type to OCU or DSU. When configuring DDS operations, this command returns an error if executed on a slot with an RS-232 back card. It forces a back card slot from RS-232 mode to DDS mode if a back card is not installed and there are no connections. Any Y-cable association is deleted in this case. The clocking tracks the DDS port interface type. OCU type interfaces are configured as "looped", and DSU type interfaces are configured as "normal". The default interface is "DSU".

When configuring CDP or CVM operation, this command configures DCE types as "normal" clocking and DTE types as "looped" clocking. The default type is DCE. For T1 lines, DS0A on T1 unassigned signalling is configurable. When a connection is not present, voice channels are converted to data channels.

Full Name

Configure data channel interface type.

Syntax

cnfdchtp <channel> <interface type> [unassigned signaling]

Related Commands

none

Attributes

Example 1

cnfdchtp 31.1 oc

Description

Configure DDS channel 31.1 as OCU

System Response

Example 2

cnfdchtp 22.1 dce

Description

Configure channel 22.1 as DCE with T1 unassigned signalling.

System Response

cnfdclk

Configures the clocking for a data channel. In general, the clock configuration may be normal, split, or looped for an SDP or HDM (fewer options for an LDP or LDM). The clock configuration of each channel of a connection determines how the clock will be propagated through the network, and how external equipment should be synchronized.

If clocking is not set correctly, there may be no synchronization, and the connection will operate in a plesiochronous mode. Each data port can be configured independently to act as either DCE or DTE by adjusting the jumper (SDI card) or changing the adapter cable (LDI card) on the data interface card. The effect of the clocking type designated depends on whether each data port is configured as DTE or DCE. The following data clocking configurations are possible with the cnfdclk command:

DCE-Configured IPX/IGX Data Port: Normal Clocking

When the data port is configured as DCE, selecting a clocking type of "n" (for normal) results in clocking as illustrated below. The IPX or IGX, acting as DCE, provides both the transmit and receive data clocks to the user equipment.

Figure 8-1:

DCE-Configured IPX/IGX Data Port: Split Clocking

When the data port is configured as DCE, selecting a clocking type of "s" (for split) results in clocking as illustrated below. In "split" clocking, TT may be generated independently of RxC. The maximum data rate for split clocking is 112 kbps.

Figure 8-2:

DCE-Configured IPX/IGX Data Port: Looped Clocking

When the data port is configured as DCE, selecting a clocking type of "l" (for looped) results in clocking as illustrated below. The "Terminal Timing" signal, called TT or XTC, is simply RxC looped back from the user equipment. In this configuration, it is important that the two clocks (RxC and TT) be frequency locked. This clocking configuration is supported for all data rates.

Figure 8-3:

DTE-Configured IPX/IGX Data Port: Normal Clocking

When the data port is configured as DTE, selecting a clocking type of "n" (for normal) results in clocking as illustrated below. The IPX, acting as DTE, receives both the transmit and receive data clocks from the user equipment. When the user equipment is not referenced to the network clock, the maximum data rate for this configuration is 112 kbps. The two clocks must be frequency-locked for proper operation.

Figure 8-4:

DTE-Configured IPX/IGX Data Port: Split Clocking

When the data port is configured as DTE, selecting a clocking type of "s" (for split) results in the clocking as illustrated below. When the user equipment is not referenced to the network clock, the maximum data rate for this configuration is 112 kbps. The two clocks must be frequency-locked for proper operation.

Figure 8-5:

DTE Configured IPX Data Port: Looped Clocking

If you specify clocking type of "l" (looped) when the data port is in DTE mode, the result is the clocking arrangement shown in Figure 8-6 . The RxC clock signal is the TT(XTC) signal looped back to the IPX or IGX by the user equipment. The network supports this clocking configuration for all data rates. The restrictions to the data clocking schemes are:

• Except for special cases, isochronous clocking is limited to data rates of 112 Kbps or less. For higher data rates, all clocks must be frequency-locked to the network.

• For any port there must be only one isochronous clock in a direction. Any situation where user equipment provides two clock signals that are not locked is subject to slippage.

• Slippage may also occur in any situation where there are opposing user clocks for a single direction of data.

Figure 8-6:

cnfict

Sets the interface control template signals. The signals that can be set using cnfict depend on the type of back card used and whether the hardware is configured for DCE or DTE. On an IPX, the applicable front cards are the SDP, LDP, FRP, CDP (for data), and FTC (for data). On an IGX, the applicable front cards are the LDM, HDM, FRM, CVM (for data), and FTM (for data). Each data channel has a default interface control template for its active, conditioned, and looped near and far states. The cnfict command is used to change a control template. Each interface control lead in each template is individually configured.

When Y-cable redundancy is in effect, the control template configuration for the data channels terminating at the primary slot is also applied to the data channels of the secondary slot. Any configuration information for the secondary slot is ignored. The list below shows the configurable leads. The leads are configurable for each type of data interface supported by the IPX or IGX. The entries under the "IPX/IGX Name" column indicate the abbreviations to use when specifying input or output leads on the command line. The leads listed below show the equivalence between RS-232C, RS-232D, RS-449,V.35, and X.21 interfaces. The IPX treats leads impartially for non-interleaved connections. Any signal received on an EIA pin at one end may be transmitted to any pin at the other end, up to the maximum of 12 EIA leads on any interface type. For interleaved EIA connections, refer to the "Fast EIA" column. The column shows which leads are carried in the interleaved bytes in the data packets. All remaining leads are carried in traditional control lead packets.

Note that pins 11 and 23 on an RS-232 port are bi-directional, and their default direction is input. See the cnfcldir command for information on changing the direction of these pins. The cpyict command can be used to copy an interface control template from one data channel to another. It can then be edited using the cnfict command. The dspbob command displays the state of leads at specified intervals.

Full Name

Configure interface control templates

Syntax

cnfict <port> <template> <output> <source>

Related Commands

addextp, dspict, tstport

Attributes

Example 1

cnfict 31.1 c SB on

Description

Configure the conditioned interface control template for channel 31.1 to SB on (DDS).

System Response

Example 2

cnfict 25.1 a CTS on

Description

Configure the active interface control template for channel 25.1 to CTS on (RS-232).

System Response

Example 3

cnfict 5.1 active CTS on

Description

Configure the active interface control template for channel 5.1 to CTS on (V.35).

System Response

cpyict

Copies all control template information associated with a given channel: the active template information, the conditioned template information, and the looped template information for near and far ends. Once copied, the control template information may be edited with the cnfict command. See the cnfict command for more information on interface control templates.

On an IPX, the applicable front cards are the SDP, LDP, FRP, CDP (for data), and FTC (for data). On an IGX, the applicable front cards are the LDM, HDM, FRM, CVM (for data), and FTM (for data).

Full Name

Copy interface control templates

Syntax

cpyict <source_port> <destination_port>

Related Commands

cnfict, dspict

Attributes

Example 1

cnfict 25.1 25.2

Description

Copy the interface control template for data channel 25.1 to channel 25.2

System Response

delcon

Removes connections from the network. After entry of the channel or range of channels to delete, a prompt requests confirmation of the selection. Connections can be deleted from the node at either end of the connection. Do not delete a connection when the node at the other end of the connection is unreachable. The unreachable node does not recognize the deletion. It is especially important not to delete a connection to an unreachable node and then connect that channel to another node.

Full Name

Delete connections

Syntax

delcon <channel(s)>

Related Commands

addcon, dspcon, dspcons

Attributes

Example 1

delcon 3.1

Description

Delete connection 3.1.

System Response

dspchcnf

Displays configuration details for data channels. This command provides information for voice, Frame Relay, ATM, and data channels. For data connections on the specified card and starting with the specified channel, the dspchcnf command displays the following information:

• Maximum EIA update rate

• Percentage of channel utilization

• DFM pattern length

• DFM status.(enabled or disabled)

The data cards that support this command are the SDP and LDP on the IPX and the HDM and LDM on the IGX.

Full Name

Display channel configurations

Syntax

dspchcnf <start_channel>

Related Commands

cnfchadv, cnfchdfm, cnfchdl, cnfcheia, cnfchgn, cnfchtp, cnfchutl, cnffrcon

Attributes

Example 1

dspchcnf 3.1

Description

Display the configuration values for data channels starting at 3.1.

System Response

dspcon

Displays connection information for a specified channel. The information displayed includes:

• The channel numbers for both the local and remote ends of the connection.

• The node names at both ends of the connection.

• The routing restriction.

• The class of service (COS) of the connection.

• The connection route. listing the end nodes and any intermediate nodes.

• The preferred route for the connection (if configured).

• The status of the cards associated with the connection.

• Any Y-cable conflicts.

• The compression status (VAD on or off, ADPCM on or off, DFM on or off, frame relay
  compression on or off).

• The connection descriptor (if configured).

The status that may be displayed includes:

Full Name

Display connection

Syntax

dspcon <channel>

Related Commands

cnfchec

Attributes

Example 1

dspcon 13.1

Description

Display information for data channel 13.1. This connection is FAILED and "off hook."

System Response

dspcons

Displays a summary of the connections on an IPX or IGX node. Status that may be displayed includes:

The following fields appear in the dspcons screens:

Full Name

Display connections

Syntax

dspcons [start_channel] [nodename] [connection type] [+d]

Related Commands

addcon, cnfchadv, chfchdfm

Attributes

Example 1

dspcons

Description

Display a summary of all connections.

System Response

Example 2

dspcons +d

Description

Display the connection with descriptors.

System Response

dspict

Displays interface control template information for data channels and frame relay ports. Displayed information includes:

• The specified channel.

• The type of template: a, c, l, n, or f.

• The associated output leads and their status:

  ON.
OFF.
Following a local input.
Following a remote input.

For frame relay ports, the entire port configuration screen is displayed (see dspfrport command). The input being followed, where applicable, is specified. Any RTS to CTS delay is also shown.

Full Name

Display interface control template

Syntax

dspict <port> <template>

Related Commands

cnfict, cpyict

Attributes

Example 1

dspict 25.1

Description

Display the active interface control template for 25.1.

System Response

prtchcnf

Prints the configuration details for voice channels or data channels. This command uses the same syntax, and prints the same information as the dspchcnf command. See the dspchcnf description for syntax and output information.

Full Name

Print channel configurations

Syntax

prtchcnf <start_channel>

Related Commands

dspchcnf

Attributes

Example 1

prtchcnf 14.1

Description

Print the configuration values of circuit line 14.1.

System Response

None available as this command produces hardcopy.

prtcons

Prints a summary of connections terminated at the IPX or IGX node.

Full Name

Print connections

Syntax

prtcons [start_channel] [nodename] [type] [+d]

Related Commands

dspcons

Attributes

Example 1

prtcons

Description

Print a summary of all connections.

System Response

None available as this command produces hardcopy.

prtict

Prints the configuration details for voice channels or data channels. This command uses the same syntax, and prints the same information as is displayed using the dspchcnf command. See the dspchcnf command for syntax and output information.

Full Name

Print interface control template

Syntax

prtict <port> <template>

Related Commands

cnfict, cpyict

Attributes

Example 1

prtict 25.1

Description

Print the active interface control template for 25.1.

System Response

None as this command produces hardcopy.

Posted: Fri Jan 19 16:59:56 PST 2001
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